Patent US4047232A successfully refreshed from Google Patents.
US4047232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leader tape
Assignee: Sony Corp
•
Filing: 1975-10-06
•
Granted: 1977-09-06
•
Expires: 1995-10-06
Abstract
Abstract A leader tape for a magnetic recording tape having a coating layer consisting of a binder and a white pigment. A surface resistivity of the coating layer is less than 1012 ohms/sq. and a transmissivity of the leader tape is more than 20 percent.
Inventors
- 👤 Yoshiaki Hisagen
- 👤 Kazuo Hoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:26
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/30; G11B23/20; G11B23/26; G11B5/00; G11B5/74; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
In a combination of a magnetic recording tape for operation from reel to reel under tension and at high lineal velocity in cooperation with a magnetic recording and/or playback head and a flexible leader tape having a nonmagnetic light-transmissive base, the improvement comprising an abrasion resistant coating layer formed on the nonmagnetic base, the coating layer consisting of a binder of 100 parts by weight and a pigment of 50 to 400 parts by weight, in which the pigment and the coating formed therewith has a light color, the surface resistivity of the coating layer being less than 10 12 ohms/sq. and the transmissivity of the coated leader tape being 20% or greater, said pigment including one or two of materials selected from zinc oxide, titanium oxide, calcium carbonate, zinc sulfide, silicon monoxide, antimony oxide, white lead, aluminum oxide, barium sulfate, lead sulfate, talc, clay, lithopone, and white carbon black.
Claim 2
Dependent Claim
150 words
In a combination of a magnetic recording tape for operation from reel to reel under tension and at high lineal velocity in cooperation with a magnetic recording and/or playback head and a flexible leader tape having a nonmagnetic light-transmissive base, the improvement comprising an abrasion resistant coating layer formed on the nonmagnetic base, the coating layer consisting of a binder of 100 parts by weight and a pigment of 50 to 400 parts by weight, in which the pigment and the coating formed therewith has a light color, the surface resistivity of the coating layer being less than 10 12 ohms/sq. and the transmissivity of the coated leader tape being 20% or greater, said pigment including one or two of materials selected from zinc oxide, titanium oxide, calcium carbonate, zinc sulfide, silicon monoxide, antimony oxide, white lead, aluminum oxide, barium sulfate, lead sulfate, talc, clay, lithopone, and white carbon black.
Claim 3
Dependent Claim
22 words
A leader tape as claimed in claim 1, in which amount of the pigment is selected 100 to 300 parts by weight.
Claim 4
Dependent Claim
21 words
A leader tape as claimed in claim 1, in which the nonmagnetic base has coating layers on its both side surfaces.
Claim 5
Dependent Claim
18 words
A leader tape as claimed in claim 1, in which the nonmagnetic base is made of polyethylene terephthalate.
Claim 6
Dependent Claim
16 words
A leader tape as claimed in claim 1, in which the binder contains an antistatic agent.
References Cited (Backward Citations)
US2875098A
Cited
US3212890A
Cited
US3574674A
Cited
US3622420A
Cited
US3656996A
Cited
US3729203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |